vyges physical dft — CLI reference

Generated from vyges physical dft --help — this page is the tool’s own output, verbatim.

vyges physical dft — scan insertion and stitching, so a chip can be tested after fabrication

USAGE:
  vyges physical dft replace <design.odb> --liberty FILE... -o OUT.odb [--dont-use CELL...]
                                                  replace each flop by its best-matching scan cell
  vyges physical dft run     <design.odb> --liberty FILE... --sdc FILE -o OUT.odb [--max-length N]
                           [--max-chains N] [--clock-mixing no_mix|clock_mix] [--trace]
                                                  stitch the planned chains and record them
  vyges physical dft report  <design.odb> --liberty FILE... --sdc FILE [--max-length N]
                           [--max-chains N] [--clock-mixing no_mix|clock_mix] [--verbose]
                                                  the scan chains as planned
  vyges physical dft --describe
  vyges physical dft --help
  vyges physical dft --version

OPTIONS:
  -o FILE               write the report (or the output database) to FILE
  --liberty FILE        a Liberty library (repeatable, in read order; a cell resolves to the
                        first library that has it)
  --dont-use CELL       a scan cell `replace` must not use (repeatable; `*` and `?` match as in
                        a Tcl pattern)
  --json                machine-readable output instead of the text report
  -q, --quiet           suppress non-essential output
  -v, --verbose         extra detail on stderr
  --describe            print a machine-readable JSON description of the command
  --bug-report          file a bug (central: vyges/community)
  --feature-request     request a feature (central)

EXIT STATUS:
  0  ok
  1  a finding — the check ran and failed
  2  usage or unreadable input
  3  refused — this build does not implement the command yet

Contract

Generated from vyges physical dft --describe.

`dft`

Scan insertion and stitching, so a chip can be tested after fabrication.

Maturity: discovered

run {design} --liberty {liberty} --sdc {sdc} -o {out}

Input	Type	Required	Description
`design`	string	yes	design database (.odb) whose flops have been scan-replaced
`liberty`	string	yes	Liberty library (.lib) holding the design’s cells
`sdc`	string	yes	timing constraints (.sdc): the clocks that group the scan cells
`out`	string	yes	database (.odb) to write, with the chains stitched and recorded
`max_length`	integer	no	the longest chain wanted, in bits (default 200)
`max_chains`	integer	no	at most this many chains per group; chains are lengthened rather than exceed it
`clock_mixing`	string	no	whether a chain may mix clock domains (default no_mix)

Consumes: odb, liberty, sdc

Artifacts: odb (out)

Assertion: dft-stitched — none; this operation establishes no engineering claim

Provenance limitations

replace, report and run are built; scan port name patterns are the defaults.
report and run refuse a design with child blocks, and constraints whose clocks are not each on one port.
replace refuses a library where two scan cells are equally close in drive to a flop, or where a pg_pin has no known pg_type.
The described call is run: the scan chains planned over the design’s scan cells, stitched, recorded in the database and the database written to out. It stitches only flops that are already scan cells: run replace on the design first (the engine’s own arguments), or every flop is skipped with a DFT-0007 warning and 0 chains are stitched, exit 0.
One Liberty is described; more libraries (a cell resolves to the first that has it) need the engine’s own arguments.
run prints its log and writes the database; it has no –json output (a –json is refused as an unknown option, exit 2), so emits_json is false and the result is the printed log. The chain count is printed on stderr.
Scan stitching establishes no claim about the design: the assertion is not_applicable.
input_hash covers the argument vector, not the content of the database, Liberty or SDC it names.

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Vyges

vyges physical dft — CLI reference

Contract

dft

`dft`